Hi,
I have made about three crazy quilts. THe method I was shown is to start with a square of muslin that you want to be your basic block size. Somewhere near the middle of it place a "5" sided piece of fabric. Then flip and sew your next piece of fabric to one side press it down and then continue adding pieces on each flat side until the muslin is completely covered. At that point you might want to sew a basting stitch around the raw edges just to keep everything in place while you embellish the block. This is the fun part. You can couch lace or any kind of decorative trim over the seams or just sew over them with a decorative stitch either by hand or with your machine. My Bernina has lots of unusual stitches. I had a blast using different threads and stitches. Once you have completed as many blocks as you want you can sew them together either next to one another or add sashing. A crazy quilt usually doesn't have batting and the backing can be just plain cloth. The that I didn't use sashing in I tied every foot or so. The second one with sashing I machine quilted down the center of the sashing to hold the thing together. THey were a lot of fun. Remember that a crazy quilt is usually just for show and a way to use all of those unpractical fabrics that we sometimes can not resist buying.
Have fun.